1MHz 3A Step-Down DC/DC Converter
Typical Characteristics
Loop Crossover Gain and Phase
16
12
8
AAT1154
Transient Response
(I
OUT
= 0 to 3.0A; V
OUT
= 3.3V; V
IN
= 5.0V)
180
135
90
100
0
3x 100μF 6.3V Ceramic
TDK P/N C3325X5R0J107M
7
6
120μF 6.3V Tantalum
Vishay P/N 594D127X96R3C2T
Phase
Phase (degrees)
Inductor Current
(bottom) (A)
Gain (dB)
4
0
-4
-8
-12
-16
10000
45
0
Output Voltage
(top) (mV)
-100
-200
-300
-400
-500
-600
-700
0
100
200
300
400
5
4
3
2
1
0
-1
500
Gain
-45
-90
-135
-180
100000
Frequency (Hz)
Time (μs)
μ
Transient Response
(I
OUT
= 0 to 3.0A; V
OUT
= 3.3V; V
IN
= 5.0V)
100
0
2x 100μF 6.3V Ceramic
TDK P/N C3325X5R0J107M
7
6
Tantalum Transient Response
(I
OUT
= 0 to 3.0A; V
OUT
= 3.3V; V
IN
= 5.0V)
100
0
7
6
Inductor Current
(bottom) (A)
Inductor Current
(bottom) (A)
Output Voltage
(top) (mV)
Output Voltage
(top) (mV)
-100
-200
-300
-400
-500
-600
-700
0
100
200
300
400
5
4
3
2
1
0
-1
500
-100
-200
-300
-400
-500
-600
-700
0
120μF 6.3V Tantalum
Vishay P/N 594D127X96R3C2T
100
200
300
400
500
5
4
3
2
1
0
-1
Time (μs)
μ
Time (μs)
μ
8
1154.2006.09.1.6
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
